package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements Ordered, GlobalFilter {
    /**
     * token校验
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1,获取request和response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2,判断是否为登录请求
        if (request.getURI().getPath().contains("/login")) {
            chain.filter(exchange);
        }
        //3,判断请求中是否有token
        String token = request.getHeaders().getFirst("token");

        if (StringUtils.isEmpty(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //4,判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int status = AppJwtUtil.verifyToken(claimsBody);
            if (status == 1 || status == 2) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //获取token中的id
             Object userId = claimsBody.get("id");
            //在header中添加新的信息
            ServerHttpRequest httpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId",userId+"");
            }).build();
            //重置header
            exchange.mutate().request(httpRequest).build();

        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5,放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置，数值越小，优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
